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PROTOCOL-SPECIFIC INFORMATION
9.3
Allen Bradley CSP (PCCC) Server
9.3.1 Overview
Ethernet-enabled Allen-Bradley legacy PLCs (such as the PLC5E, SLC-5/05, and MicroLogix series)
use a protocol called CSP (Client Server Protocol) to communicate over the Ethernet network. The
flavor of CSP used by these PLCs is also known as "PCCC" (Programmable Controller Communication
Commands) and "AB Ethernet". The interface card supports CSP for direct connectivity to these PLCs.
Note that CSP runs under EtherNet/IP and is enabled by default when EtherNet/IP is added to the
configuration.
If a connection timeout or socket-level error occurs, the driver can be configured to perform a timeout
action as described in section 9.2.3.
9.3.2 Explicit Messaging Via Read/Write Services
Register contents are read from and written to the interface card via CSP by reference to an integer
"file/section number" and an "offset/element" within that file. The supported read and write services are
listed in Table 34. To read and write data, the client must reference a "target address" and the "size of
elements". The target address is constructed according to the conventions shown in section 9.3.3.
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